Door-lock.



W. E. WALKER.

DOOR LOCK.

APPLICATION FILED JUNE 1. 1915.

1 152 865. PatentedSept. 7, 1915.

TED %TATE% PATENT @FFTEE.

WILLIAM E. WALKER, OF SEATTLE, WASHINGTON.

DOOR-LOCK.

To all whom it may concern:

Be it known that 1, WILLIAM E. lVALKnR, a citizen of the United States, residing at Seattle, in the county of King and State of ll ashington, have invented a new and useful Door-Lock, of which the following is a specification.

This invention relates to door locks, the same being especially designed for use in hotels and like places where it is desired to prevent the opening of the door by unauthorized persons.

One of the objects of the invention is to provide a novelform of guard the movement of which is controlled by the bolt of the lock, this guard operating to close the keyhole so as to prevent the insertion of a key from outside the door after the door has been locked from the inside.

A further object is to provide a shield or guard which will not close the keyhole if the key is inserted from the outside of the door to lock the door.

Another object is to provide a device of this character which is simple, compact and efficient, and which can be applied readily to ordinary forms of locks.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, can be made within the scope of what is claimed, without departing from the spirit of the invention.

lln the accompanying drawings the pre ferred form of the invention has been shown.

In said drawings :Figure 1 is an elevation of a mortise lock with the cover plate removed. Fig. 2 is a like view of a portion of the lock and showing the bolt shifted to locking position and the guard in position across the keyhole. Fig. 3 is a section on line AB Fig. 1. Fig. 4 isa perspective view of the guard plate. Fig. 5 isa perspective view of the bolt. Fig. 6 is a perspective view of the tumbler. Fig. 7 is a perspective view of a portion of the key.

Referring to the figures by characters of reference 1 designates the casing of a lock, the same being provided with a bolt 2 of the usual form. This bolt is preferably provided on one side with a longitudinal Specification of Letters Patent.

Application filed June 7, 1915.

Patented Sept. "Z, 1915.

Serial No. 32,637.

rib 3, and there being guide projections A within the casing and between which the ceiving recess 7 is formed in the bottom of the bolt adjacent the projection 6 and extends upwardly close to the rib 3, the walls of the recess constituting wards for engagement by the bit of a key. A stud 8 is formed on the casing. and is located at one side of the bolt 2 and pivotally mounted on this stud is a tumbler 9 having upwardly extending arms 10 provided with upwardly projecting ears 11 normally resting on the top of the bolt 2. The projection 5 is adapted to be seated between projection 4 and one of the ears 11 when the bolt is retracted, and as shown in Fig. 1. That portion of the tumbler 9 below the arms 10 is formed with an upwardly curved edge 19. which is. normally located above the lower end of the bolt 2, the tumbler serving normally to close the space at one side of the recess 7 in the bolt.

Slidably mounted on one side of the bolt 2 is a guard plate 18 having a longitudinal groove 14.- into which the rib 3 projects. This plate has an upstanding finger 15 which extends between the endear ll of tumbler 9 and the adjacent end wall of casing 1. A blade 16 extends downwardly from the plate and below the finger 15, this blade being preferably arranged to slide within a slot 17 formed in the bottom of casing l. A longitudinal slot 18 is extended into the front or advancing edge of the blade 16, the open end of this slot 18 being enlarged as shown at 19. An inverted sub stantially V-shaped recess 20 is formed in that side of the plate 13 nearest the bolt 2 and is of the same contour as the recess 7 in the bolt, the walls of this recess constituting wards for engagement by the bit of a key. Furthermore this recess 20 is so positioned that, when the guard plate 13 is in its normal position, as shown in Fig. l, the said,

recess 20 and the notch or opening 7 will register. A keyhole slot 21 is formed in the casing l and when the parts are in their normal positions, the front or advancing edge of the blade 16 will aline with the rear walls of the keyhole slot 21, as shown in Fig. 1. As blade 16 is of less thickness than the plate 13, increased space is provided under the bolt for the reception of the bit of the key used in actuating the lock. A spring 22 is secured in the casing 1 and bears at one end against the front or'advancing'edge of located that when the key is inserted into the slot 21 from outside the door towhich the lock is secured,thebit 24 can be turned without engaging the walls of the recess 20 in plate 13. However, the bit 24c will engage-the walls of the notch or opening 7. Consequently the turningof the key when inserted from outside'of the door will result in throwing the bolt2 to projected position without, however, producing a corresponding movement or" the guard plate 13. Obviously,therefore, the key can be withdrawn readily after the bolthas been shifted. Furthermore the key can be readily inserted for thepurpose of retracting the bolt so as to open the door from the outside. If, however, the key should be inserted into the look from the inner side of the door, the bit 24 would be brought to position where it will engage the walls of the recess 20. Con-' sequently the rotation of the bit will result not only in the projection of the bolt 2 to locking position, but will also result in the movement of the'guard plate 13 with the bolt so that blade 16 will be brought to position across the outer keyhole slot 21, thus acting as an effective means to prevent the insertion of a key into the look from the outer side or the door. It is to be under- Copies of this patent may be obtained forstood that when the guard plate 13 is shiftfact that each time the key is turned in the I lock, the bit thereof will work against the curved edge 12 of the tumbler 9 and swing the tumbler upwardly so that the ears 11 will be lifted out of the path of the projection 5 on the bolt while the bolt is being shifted. As soon as the bolt has been shifted in either direction, a spring 26 above the bolt and which bears on the tumbler will return the tumbler to its lowered or' active position.

What is claimedis The combination with a lock casing, a bolt, a guard plate slidably engagingthe bolt and normally positioned at one sideof the keyhole slot in the casing, and a tumbler for holding the bolt andguard plate in either of two positions, of wards upon the bolt for engagement by the bit of a key when inserted into either side of the lock casing, and wards upon the guard plate for engagement by the bit of a key when inserted in one side of the casing, said wards on the guard plate being out of the path of fivecents each, by addressing the Commissioner of Patents,

Washington, 1). C. V 

